Electrical Braking System for Road Pavers
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Solution Overview
Problem
Existing braking systems in self-propelled pavers and feeders are prone to failure due to complex hydraulic setups and require extensive installation, making them unreliable and labor-intensive.
Innovation Solution
A braking system controlled by electrical signals, replacing hydraulic lines with electrical cables, and utilizing separate actuation paths with redundant sensors to achieve different braking characteristics and redundancy, allowing for reliable and easy installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hydraulic lines and brake lines are laid to each driven wheel, then braking function is achieved, but installation work and system complexity increase significantly
Solution Approach 1:
The patent replaces the hydraulic braking system with an electric braking system. Instead of using hydraulic lines to transmit braking force, the invention uses electric motors as braking devices that are controlled by electrical signals. This substitution eliminates the need for complex hydraulic line installations while maintaining reliable braking function.
Solution Approach 2:
The electric motors serving the driven wheels are made multi-functional by enabling them to operate both as drive motors and as braking devices. This eliminates the need for separate hydraulic braking systems, reducing installation complexity while maintaining reliable braking capability across all driven wheels.
2Reliability
If three equivalent sensors are assigned to the brake pedal for redundancy, then braking reliability improves, but installation effort and system complexity increase
Solution Approach 1:
The patent combines multiple sensing functions into a single sensor system. Instead of installing three separate sensors with individual connections, the invention uses one sensor to detect the brake pedal position and generates multiple electrical signals through signal division. This merging approach maintains redundancy while significantly reducing installation complexity.
Solution Approach 2:
The patent segments the actuation path into multiple sections (first actuation path and second actuation path), with each section generating separate electrical signals. This segmentation provides redundancy and different braking characteristics without requiring multiple physical sensors, thereby reducing installation complexity while maintaining reliability.
3Ease of operation
If brake fluids are used in the braking system, then braking function is achieved, but failure risk increases in harsh operating conditions
Solution Approach 1:
The patent replaces the hydraulic brake fluid system with an electric control system. Instead of using brake fluid that can leak or fail under harsh conditions, the invention uses electric motors and electrical signals to achieve braking. This substitution eliminates the reliability issues associated with brake fluids while maintaining effective braking function.
Data Source
AI summary
Road pavers or feeders with hydraulic and electric drives are typically braked hydraulically. This requires the installation of brake lines designed as pipelines, which are prone to failure in the harsh operating conditions of a road paver or feeder. The invention provides for braking each driven wheel (10) of the road paver or feeder by means of electrically controlled braking devices. The braking devices can be formed by switching hydraulic motors (18) to hydraulic pumps or electric motors to generators, but also additionally or alternatively by multi-plate clutches (22) or multi-plate brakes. As a result of the electrical control of the braking devices, the complex installation of brake fluid pipelines is eliminated. Furthermore, the susceptibility to failure is reduced, particularly because redundant signal lines can be easily implemented when the braking devices are electrically controlled.